Enhancing the Hydrogen Evolution Reaction Activity of Platinum Electrodes in Alkaline Media Using Nickel–Iron Clusters
Enhancing the Hydrogen Evolution Reaction Activity of Platinum Electrodes in Alkaline Media Using Nickel–Iron Clusters
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DOI：
10.1002/anie.202000383
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发表时间：
2020-03
期刊：
影响因子：
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通讯作者：
Song Xue;Richard W. Haid;Regina M. Kluge;Xing Ding;Batyr Garlyyev;J. Fichtner;Sebastian Watzele;Shujin Hou;A. Bandarenka
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文献类型：
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作者：
Song Xue;Richard W. Haid;Regina M. Kluge;Xing Ding;Batyr Garlyyev;J. Fichtner;Sebastian Watzele;Shujin Hou;A. Bandarenka
本文介绍了一种通过引入Ni-Fe团簇来提高铂电极在碱性介质中析氢反应(HER)活性的简单方法。结果，在氢气饱和的0.1mKOH中，达到10 mA cm−2的电流密度所需的过电位降低到约70 mV。据我们所知，这些修饰电极的性能优于在类似条件下测试的任何其他已报道的电催化剂。此外，还研究了1)Ni/Fe比，2)团簇覆盖度，3)电解液中碱金属阳离子的性质对HER活性的影响。所观察到的催化性能可能源于Ni-Fe团簇上水解离的改善，以及随后在Ni-Fe/Pt边界处的铂原子上的最佳氢吸附和复合。
Abstract Herein, we demonstrate an easy way to improve the hydrogen evolution reaction (HER) activity of Pt electrodes in alkaline media by introducing Ni–Fe clusters. As a result, the overpotential needed to achieve a current density of 10 mA cm−2 in H2‐saturated 0.1 m KOH is reduced for the model single‐crystal electrodes down to about 70 mV. To our knowledge, these modified electrodes outperform any other reported electrocatalysts tested under similar conditions. Moreover, the influence of 1) Ni to Fe ratio, 2) cluster coverage, and 3) the nature of the alkali‐metal cations present in the electrolyte on the HER activity has been investigated. The observed catalytic performance likely originates from both the improved water dissociation at the Ni–Fe clusters and the subsequent optimal hydrogen adsorption and recombination at Pt atoms present at the Ni–Fe/Pt boundary.